More suitable than what? Than a ballast that's doing what it's intended for and is working properly? Maybe you could pull it apart, replace the ballasts with more expensive higher quality ballasts, cut some ventilation holes, put in a couple fans for circulation...And then you'll end up with cheap working light that you've made likely less reliable, uglier and more expensive.
The cases get hot, that's how they dissipate heat it's working as intended.